Tube-extracting jack



Aug. 17 1926. 1,596,464

D. SMITH TUBE EXTRAGTING JACK Filed 001:. 27, 1924 zlZ - Inveniur.

David Smith y M ATTys Patented Aug. 17, 1926.

UNITED STATES rATsNT: OFFICE. Y

DAVID SMITH, 0F WELLESLEY, MiAssAcH'Us'ETTS.

TUBE-EXTRACTING LACK. I

Application filed October 27,1924] .Serial No. 746,052.

or which maybe employed to set the tube in the boiler head.

The usual process of removing boiler tubes from boiler heads consists infirst cutting away the upset end "of the tube which passes through oneofetheboilerheads, then carefully removing the incrustation pon the eX-terior of the tube adjacent the other boiler head and thereaftermanipulating the tube by means of wrenchesflevers, or otherdevices toforce the tube through such boiler head. Asthe tube is progressivelyforced along. through the head the scale and momstations have to bevscraped away so that a great deal of time is required to remove thetube.

One of the objects ofthe tion is to provide an extractingdevicein theform of a jack which can be readilysupported upon the tube and throughwhich sufficient power can be applied to the tube to pull itrthrough theboiler head nothwithstanding the scale-which has accumulated uponthetube. The device is also so arranged that it can beapplied to theexternal a end port on of the standard is provided with surface of theboiler heada'fter the tube has been projected a sufficient distancethrough it and thereaftertjhe extraction of the tube quickly completed.

Another object of the invention is to provide a device of the'characterdescribed in which the tube can be readily drawn through the boiler andinserted into the opposite head in like manner and with much greaterrapidity than has heretofore been possible.

A further object of the invention is to provide a device of thischaracter which canbe' detachably supported upon the boilertubeirrespective of its size and'the force applied to the tube insubstantially the direction of its axis. I

Another feature of the invention consists in providing the liftingmember. of the jack wvith a novel means for engaging the tube which willinsure a positive clamping action thereupon.

; the left; and,

present inven- Other objects andv featuresiof the invention will morefully appear from the follow? ing description and the accompanyingdrawings and will be particularly pointed out in the claims.

In the drawings: I

Fig. .1 is a view' mainly in longitudinal section, of a preferred formof tube-extracting and setting device supported upon a boiler tube whichprojects through the-head of the boiler, the boiler head being alsoshown in section, while the tube is shown in elevation;

Fig 2 is an end view of the device illustrated in Fig. 1; Y

Fig.3 is a verticalsectional View on line Fig. 1 viewed from therighttoward Fig. is .a, detail view showing a section of a boiler tube withthe clamping-jaws engaging the same and illustrating the jaws insection.

The tube extracting and setting device illustrated in the accompanyingdrawings is in the form of a ack having a base 1 pro 'vi-ded with arecess to receive the boiler tube and a standard 2 "havingalongitudinally extending strengthening rib provided with an aperturewhich forms a guideway for the lifting member 4 which desirably is inthe'formof arack having teeth '5,. The upper .ears 6 which form supportsfor the pivotal shaft "7 'of an actuating lever '8, a dog 9 beingp'ivotally mounted upon the end of the lever and'norma'll-y held inengagement with the rackby a spring .10.. The-dog') may also be'providedwith a handle member 11 which mz'rybe ofsu'flicient'weighttoaid in the holdof the pawl in'engagement with therack and which also may be actuated .to release drically curved surface12 to engage the boiler tube-13 and parallel .webs l4 and 15 constitutetangential V continuations of the curved surface 12. These websdesirably are providednear the base of the jack with a series .ofalined. holes 16 to receive a pin 17 by'means of which. the jack can besupported "uponithetube. The free end ofthe raokfia provided with abifurcated head 18 in which an extension 1.9 of a clamping jaw member 20is pivotally mounted upon a pin 21. The clamping jaw member desirably isof substantially semi-cylindrical form and its concave face is providedwith semi-circular ribs or teeth 22 to engage the surface of the pipe.

The jaw member 20 has a lateral extension 23 to which a complementaryjaw 24 is pivotally connected by a pintle 25. The extension 28 desirablyis provided with a plurality of holes 23 for the pin'tle'25 to permitadjustment of the movable jaw for dif ferentsizes of tubes. The freeends of the jaw members 20 and 2d are provided with flanges 26 and 27.

Suitable means are provided for forcing these flanges toward each otherto clamp the jaw members upon the pipe. A convenient means which isillustrated herein comprises a bolt 28 which passes through the jawflange 27 and is provided with screw threads which engage the jaw member26, a collar 29 upon the bolt 28 providing a shoulder which engages theflange member 27. The bolt 28 is provided with a handle 30 of anysuitable form by means of which it may be rotated.

' In Fig. 1 the sectional pipe 13 is illustrated as having beenpartially pulled through the boiler head 31. The webs 14 and 15 of thejack embrace the sides of the tube and the jack is supported upon thetube by the pin 17 which passes through the complementary apertures 16which are located nex beyond the diameter of the pipe as measured fromthe concave face 12 of the standard. As shown in this figure theclamping jaws 20 and 2a have been tightly set upon the pipe. In order toextract the pipe from the boiler head the lever 8 is manipulatedmanually to force the rack lengthwise of the standard. Such movementexerts a force substantially in the direction of the axis of the pipeand the pivotal mounting of the jaw member 20 upon the head 18 of therack permits such movement of the clamp relative to the axis of the pipeas to insure a positive clamping action much greater than could beobtained if the jaw members were rigid with the head of the rack. Byreason of this construction so great force may be .applied to the boilertube thatit can be pulled through the boiler head rapidly and withoutthe necessity of removing the scale and incrustations from the tubebefore its extraction.

A jack of this character may be made of such size that it can beemployed within the boiler particularly after one or more tubes havebeen removed to give room for the manipulation of the handle. A boilertube may be forced through the boiler head into the boiler in a similarmanner by providing a suitable abutment for the base of the jack or byapplying the base of the jack to the inner face of one of the boilerheads when it is feasible to do so.

By reason of the present construction vise jaws can be readily appliedto the tube and when the raclr bar has been drawn out to its imit can bereadily released, the rack bar telescoped within the standard and thevise jaws again quickly attached-to the tube.

It will be understood that the embodiment longitudinally of saidstandard and means for clamping said tube pivotally connected to saidlifting member.

2. A tube extractor and setter comprising a jack having a channel shapedstandard to receive the tube, means for detachably securing the standardupon the tube, a lift ing member, means for reciprocating the samelongitudinally of said standard, a clamp pivotally mounted upon saidlifting member provided with hinged jaws to embrace the tube and meansfor engaging the free ends of said jaws to clampthem upon the tube.

3. A tube extractor and setter comprising a jack having a standardprovided with a wall to engage the tube and with webs extending fromsaid wall to receive the tube therebetween, means engaging said webs fordetachably securing the standard upon the tube, a rack reciprocablymounted in said standard, means for actuating the same, a clamppivotally mounted upon said rack, having a pair of hinged aws to embracethe tube and means for clamping the jaws upon the tube. 7

l. A tube extractor and setter comprising a jack having a standardprovided with a rectangular guideway extending longitudi nally thereof,parallel longitudinal webs extending from one of the walls of saidstandard to provide a tube-receiving channel, a rack reciprocable insaid guideway, a lever pivotally mounted on said standard having a pawlengaging said rack, a clamp pivotally mounted upon said rack, having apair of hinged jaws to embrace the tube and means for clamping thejawsupon the tube.

- 5. A tube extractor and setter comprising a jack having a standardprovided with a rectangular guideway extending longitudi nally thereof,parallel longitudinal Webs extending from one of the Walls of saidstandardto provide a tube-receiving channel, pairs of alined openings insaid Webs to receive a pin for detachably securing said jack upon thepipe, a rack reciprocably mounted in said guideway, a lever pivoted tosaid standard having a pawl engaging said rack,

DAVID SMITH.

